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The Virtual Router Redundancy Protocol (VRRP) for IPv4 is defined in the IETF RFC 3768, Virtual Router Redundancy Protocol. VRRP for IPv6 is specified in draft-ietf-vrrp-unified-spec-02.txt. VRRP describes a method of implementing a redundant IP interface shared between two or more routers on a common LAN segment, allowing a group of routers to function as one virtual router. When this IP interface is specified as a default gateway on hosts directly attached to this LAN, the routers sharing the IP interface prevent a single point of failure by limiting access to this gateway address. VRRP can be implemented on IES service interfaces and on core network IP interfaces.Figure 13 displays an example of a VRRP configuration.Figure 13: VRRP ConfigurationThe preempt parameter can be set to false to prevent a backup virtual router with a better priority value from becoming master when an existing non-owner virtual router is the current master. This is determined on a first-come, first-served basis.
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• For IPv4, the default advertisement interval is 1 second and can be configured between 100 milliseconds and 255 seconds 900 milliseconds. For IPv6, the default advertisement interval is 1 second and can be configured between 100 milliseconds and 40 seconds 950 milliseconds.VRRP advertisements messages that are fragmented, contain IP options (IPv4), or contain extension headers (IPv6) require a longer message interval to be configured.For IPv4: Skew Time = ((256 - priority) / 256) secondsFor IPv6: Skew Time = (((256 - priority) * Master_Adver_Interval) / 256) centisecondsThe master down timer is only operational when the local virtual router is operating in backup mode.
→ Virtual router ID field – Must match one of the configured VRID on the ingress IP interface (All other fields are dependent on matching the virtual router ID field to one of the interfaces configured VRID parameters)
→ Priority field – Must be equal to or greater than the VRID in-use priority or be equal to 0 (Note, equal to the VRID in-use priority and 0 requires further processing regarding master/backup and senders IP address to determine validity of the message)
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→ Authentication Type Authentication DataThe inheritance is only configurable in the non-owner nodal context. It is used to allow the current virtual router instance master to dictate the master down timer for all backup virtual routers.Policies can only be configured in the non-owner VRRP context. For non-owner virtual router instances, if policies are not configured, then the base priority is used as the in-use priority.
Table 7: LAG Events Set to hold-set parameter Set to hold-set parameter Set to hold-set parameter Set to hold-set due to threshold increase Figure 14 displays the process to provision VRRP parameters.Figure 14: VRRP Configuration and Implementation Flow